This adds a number of new internal states to better capture what is
going on. Also added are checks that all transitions we make are in the
set of expected and valid transitions.
Only three drivers use the state_change notification. These drivers are
updated accordingly.
Doing this avoids race conditions in testing code where the code might
try to submit errors/images before the device has been activated. This
would then (sometimes) trigger assertions in the image driver code.
Delay the open/close callbacks by 100ms so that we have a window of
opportunity for race conditions. This is needed to test certain
conditiosn in fprintd.
Add commands to disable automatic finger reporting for images and to
send a specific finger report. This is useful to test more code paths
inside the image-device code.
In rare occasions it could happen that the driver was reading
insufficient data. Fix this by using g_input_stream_read_all_async
which will ensure that incomplete data will not be misinterpreted.
This fixes rare test failures seen in fprintd.
